JP4779512B2 - Concealment card and method for manufacturing the same - Google Patents

Description

  The present invention relates to a concealment card having a concealing layer for concealing a magnetic recording layer on a card base material, which is a card-like magnetic recording medium such as a credit card or a bank card, and a method for manufacturing the concealment card.

  For magnetic cards that require high design, such as credit cards and bank cards, a magnetic powder originally possessed by the magnetic recording layer is provided with a concealing layer on the entire substrate including the stripe-shaped magnetic recording layer portion called a magnetic stripe. 2. Description of the Related Art Conventionally, a concealment card is known in which a concealing layer that completely conceals black and brown derived from it is formed, and a design is imparted by printing a design on the concealing layer.

  However, since the concealment card manufactured in this way is printed on the surface layer side of the card, when the pattern part is printed on the concealment layer that conceals the magnetic recording layer, the pattern part and the non-picture part are recorded. There is a problem in that the distance between the magnetic head and the magnetic recording layer at the time of reproduction is different, and the spatial change in spacing loss causes a change in magnetic output, increasing the possibility of error occurrence during information reading.

For this problem, in order to eliminate the level difference between the pattern part and the non-pattern part by pattern printing, using the negative pattern of the pattern in the non-printing part, the ink of the same hue as the hiding layer formed on the entire upper part of the pattern part Is disclosed, and a method for filling the space of the non-picture part is disclosed (Patent Document 1).
However, although this method has an effect of suppressing output fluctuation, it is not perfect. Moreover, the positioning of the negative pattern is not easy, and when the positioning cannot be performed accurately, the fluctuation of the magnetic reproduction output is increased.
JP 2000-155937 A

  An object of the present invention is a concealment card having a pattern identifiable from the surface side of the concealment layer, wherein the concealment card does not cause fluctuation in the magnetic output of the magnetic recording layer even if the pattern is formed on the magnetic recording layer. And a method of manufacturing the same.

The present invention has a concealing layer having a magnetic recording layer on at least a part of a card substrate, the concealing layer laminated to conceal the entire surface of the card substrate on the side having the magnetic recording layer, and the concealment layer A method for manufacturing a concealment card having a pattern identifiable from the surface of a layer, wherein the pattern is formed in advance on a card substrate before the concealment layer is laminated and / or between the magnetic recording layer and the card substrate. And providing a method for producing a concealing card, characterized by diffusing the colorant of the pattern toward the surface when the concealment card is formed.
Further, the present invention comprises a concealing layer having a magnetic recording layer on at least a part of the card substrate, the concealing layer laminated to conceal the entire surface of the card substrate on the side having the magnetic recording layer, and A concealment card having a pattern identifiable from the surface of the concealing layer, wherein the colorant forming the pattern is distributed at least over the entire width in the film thickness direction of the concealing layer at a position corresponding to the pattern. Provide a concealment card.

  According to the concealment card manufacturing method of the present invention, the pattern is formed in advance on the card substrate before the concealment layer is laminated and / or between the magnetic recording layer and the card substrate, and the colorant of the pattern is The colorant that diffuses in the surface direction during the formation of the concealment card and forms a pattern is distributed over the entire width in the film thickness direction of the concealing layer or the concealing layer and the magnetic recording layer, etc. at a position corresponding to the pattern. Is forming. The colorant corresponding to the pattern is not localized on the surface of the masking layer like the pattern formed by the conventional method. Accordingly, the spacing, which is the distance between the magnetic head and the magnetic recording layer during recording / reproduction, is kept constant between the pattern portion and the non-pattern portion without being different. For this reason, fluctuations in the magnetic output due to the pattern do not occur.

Hereinafter, the concealment card and the manufacturing method thereof according to the present invention will be described in detail.
In the concealed card manufacturing method of the present invention, the pattern is formed in advance on the card substrate before the concealment layer is laminated and / or between the magnetic recording layer and the card-shaped substrate, and the colorant of the pattern is used. It diffuses in the surface direction when forming the concealment card through the concealment layer or the concealment layer and the magnetic recording layer.
FIG. 1 shows a cross-sectional view of an embodiment of a concealment card according to the present invention. The concealment card is formed by integrating the oversheets 1 and 4 with various functional layers applied and transferred to both ends of the center cores 2 and 3 by thermocompression bonding. The magnetic recording layer 5 is transferred to the front side oversheet, and the concealing layer 6 covers the entire surface of the magnetic recording layer 5 and the oversheet. A colorant region 9 is distributed in the film thickness direction of the masking layer 6 or the masking layer and the magnetic recording layer, and a colorant diffusion preventing layer 8 may be provided on the masking layer 6, and the colorant diffusion preventing. The layer may also serve as a protective layer. Note that a normal pattern 7 can be formed by printing on the concealing layer on a portion other than the top of the magnetic recording layer or on the back surface of the center core.

In the method for producing a concealing card of the present invention, the pattern is formed in advance on the card substrate before the concealing layer is laminated and / or between the magnetic recording layer and the card substrate, and the colorant of the pattern is A position and method for forming a pattern, a method for diffusing a colorant for forming a pattern, and a masking layer that are diffused in the surface direction of the concealment card through the masking layer or the masking layer and the magnetic recording layer There are several options in terms of the method of forming the colored diffusion prevention layer and the like.
FIG. 2 shows a process chart for forming a pattern from the transfer base material to the concealment card base material before forming the concealment layer when the oversheet and the center core are integrated by hot-pressing. . The process diagram shows two types of pattern formation processes, (CI) and (CII), but these are options for selecting at least one of the two, and pattern formation by any one process is possible. If selected, there is no need to perform the other two pattern forming steps.
Further, the transfer material heating step (aging step) (CI) -2 surrounded by a dotted line is not necessarily essential.

  In the concealment card manufacturing method of the present invention, when the pattern is provided only on the magnetic recording layer portion, the transfer recording body 14 (FIG. 3) for forming the magnetic recording layer 11 on the oversheet is used. At the same time, the pattern 13 can be formed on the oversheet 4. The position where the pattern 13 is formed on the transfer laminate 14 can be between the magnetic recording layer 11 and the heat-sensitive adhesive layer 12 of the transfer laminate 14 and at least the surface of the heat-sensitive adhesive layer 12. In order to be able to quickly manufacture a laminate for transfer from the determination of a pattern and to be able to respond quickly to a pattern change, it is preferable that the pattern formation is close to the final process of preparing the transfer laminate, and the pattern formation area is a heat-sensitive adhesive. Preferably formed on layer 12. FIG. 2 (CI) also shows a case where the pattern forming region is formed on the heat-sensitive adhesive layer. The pattern 13 formed at these positions is transferred onto the oversheet together with the magnetic recording layer 11 by a transfer process, and then integrated with the center cores 2 and 3 and the oversheet 1 on the opposite side of the center core by hot pressing. The At this time, the colorant of the pattern 13 formed in the transfer laminate is diffused toward the surface of the transfer material. The colorant in the transfer laminate is aged on the transfer laminate, that is, the surface of the laminate after transfer, by aging ((CI) -2) the transfer laminate before the hot pressing. It can be diffused in advance in the direction of the direction. Therefore, it is possible to employ aging of the transfer laminate prior to hot pressing as required.

On the thus formed concealment card substrate, a concealing layer and, if necessary, a colorant diffusion preventing layer are formed in the coating step (FIG. 4) or the transfer step (FIG. 5). The layer newly provided on the base material is brought into close contact with the base material for the concealment card by being hot-pressed, and at this time, the colorant further diffuses in the surface direction through the concealment layer.
2, 4, and 5, the concealing layer and the colorant diffusion preventing layer are produced by subjecting an integrated concealment card base material to hot press pressing, and then press-pressing the base material surface again. The concealing layer and the colorant diffusion preventing layer are formed and transferred in advance on the oversheet base material on which the magnetic recording layer is formed, and other concealment cards such as a center core and an oversheet on the opposite side are formed. It may be integrated by hot pressing at a time together with the constituents of the substrate.

As another method for forming the pattern on the magnetic recording layer portion, the magnetic recording layer may be formed in advance on the oversheet side at the position where the magnetic recording layer is formed in the transfer step before the transfer of the magnetic recording layer (FIGS. 3 and 2). CII)). The magnetic recording layer 11 is transferred onto the pattern forming region formed in this way via the heat-sensitive adhesive layer 12, and the colorant of the pattern 13 is heat-sensitive bonded during hot press that is integrated with the center core or the like. It diffuses through the agent layer 12 and the magnetic recording layer 11 toward the surface when the concealment card is formed. Thereafter, a concealing layer 6 and a colorant diffusion preventing layer 8 are further formed thereon, and further hot pressing is performed, and the colorant further diffuses through the concealing layer 6 toward the surface of the concealing card.
In this case, the concealing card base without the concealing layer and the colorant diffusion preventing layer is formed by the hot press, and the concealing layer is formed on the concealing card base for the second time. However, the concealing layer and the colorant diffusion preventing layer may be previously transferred onto the oversheet on which the magnetic recording layer is formed, and then hot-pressed together with the center core and other oversheets. It may be integrated at a time.

  When the pattern is previously formed on the oversheet substrate, the pattern may be formed on the entire surface of the substrate. In this way, in the subsequent process, part of the colorant and the like diffuses through the magnetic recording layer and the concealing layer, and the other part diffuses through the concealing layer in the surface direction when forming the concealment card. A distinguishable pattern is formed.

Hereinafter, in the concealment card manufacturing method of the present invention, each layer constituting the concealment card will be described in further detail.
As a base material used for a base material for cards such as an oversheet and a center core sheet, mechanical properties, water resistance, chemical resistance, etc. that can withstand the intended use are required. Polyethylene terephthalate (PET), polyvinyl chloride ( A synthetic resin sheet such as PVC), polycarbonate (PC), or amorphous copolyester (PET-G) is used. The thickness of the oversheet is about 50 to 100 μm, the center core sheet is 540 to 640 μm when one sheet is used, and 270 to 320 μm when two sheets are used.

In the method for manufacturing a concealment card of the present invention, the magnetic recording layer covering at least a part of the substrate can be formed by a transfer process or a coating process. When forming by the coating process, a magnetic coating containing the following magnetic powder and binder resin is applied on the substrate. When forming by the transfer process, the following magnetic recording layer transfer tape is used.
The transfer tape for a magnetic recording layer is formed by laminating a magnetic recording layer and a heat-sensitive adhesive layer on a transfer substrate, and a pattern forming region can be formed on the heat-sensitive adhesive layer.

  For the transfer laminate for the magnetic recording layer used when the magnetic recording layer is formed by the transfer step, any known and conventional film can be used as the transfer base film. Examples thereof include polyesters such as polyethylene terephthalate, polyolefins such as polypropylene, cellulose derivatives such as cellulose triacetate, and plastics such as polyamide. Of these, polyethylene terephthalate having both tensile strength and heat resistance is preferred. Moreover, there is no restriction | limiting in particular in the thickness of a transcription | transfer base film, Usually, 3-100 micrometers, Preferably it is 5-50 micrometers.

The magnetic recording layer on the transfer substrate can be formed, for example, by applying and drying a magnetic paint containing a magnetic powder, a binder resin, and a solvent for dissolving the binder resin on the transfer substrate.
As the magnetic powder, known magnetic powders such as γ-iron oxide, magnetite, cobalt-coated iron oxide, chromium dioxide, iron-based metal magnetic powder, barium ferrite, and strontium ferrite can be used. Those having a coercive force in the range of 20 to 320 kA / m are preferred.
As the binder resin used for the magnetic recording layer, known and commonly used binder resins can be used. For example, chlorination of cellulosic resins, butyral resins, acrylic resins, polyurethane resins, polyester resins, copolymers of vinyl chloride and vinyl acetate, or copolymers added with vinyl alcohol, maleic anhydride or acrylic acid, etc. Mention may be made of vinyl resins, epoxy resins, phenolic resins, melamine resins and mixtures of these resins. It can also be thermally cured using an isocyanate compound.
The colorant in the pattern formation region can be diffused through the magnetic recording layer to the surface of the transfer material comprising a magnetic recording layer, a heat-sensitive adhesive layer, and the like. Although the diffusion speed and the degree of difficulty vary depending on the type of resin, the temperature applied to the transfer material and the resin used for the magnetic recording layer can be appropriately selected and adjusted. In order to facilitate the diffusion of the colorant, the Tg of the binder resin used for the magnetic recording layer is preferably lower than the temperature applied to the transfer material.

Examples of the solvent used for the magnetic recording layer paint include ketones such as acetone, methyl ethyl ketone, and cyclohexanone, esters such as methyl acetate, ethyl acetate, and butyl acetate, alcohols such as ethanol, hexane, toluene, and xylene. A hydrocarbon can be mentioned, These solvents can also be used in mixture of 2 or more types.
If necessary, auxiliary agents such as surfactants, silane coupling agents, plasticizers, waxes, silicone oils, carbon black and other fillers may be added to the magnetic recording layer coating material.

The magnetic recording layer coating material can be obtained, for example, by kneading and dispersing the magnetic powder, the binder resin, and the solvent by a known and usual method. As the kneading and dispersing machine, for example, a two-roll mill, a three-roll mill, a ball mill, a Henschel mixer, a cobol mill, a sand mill, a disper, a homogenizer, a kneader, or the like can be used.
The coating method for the magnetic recording layer coating is not particularly limited, and a known and commonly used coating method may be used. After applying a predetermined amount of the magnetic coating, the easy magnetization direction of the magnetic powder is in the longitudinal direction of the magnetic recording layer coating. Then, the alignment treatment is performed and drying is performed. As a coating method, for example, a gravure method, a reverse method, a transfer roll coater method, a kiss coater method, a die coater method, etc. can be used, and in the magnetic recording layer coating film before drying formed on the transfer substrate by these coating methods. A magnetic recording layer can be formed by orienting the magnetic powder and drying the coating film.
The magnetic field orientation treatment is preferably performed after application by the above application method and before the coating film is dried, from the viewpoint of recording / reproduction characteristics. As the magnetic field orientation method, a known method such as a repulsive counter permanent magnet, a solenoid electromagnet, or the like can be used. The magnetic field strength is preferably in the range of 1000 to 6000G.
The dry film thickness of the magnetic recording layer is preferably in the range of 2 to 50 μm, more preferably in the range of 5 to 20 μm.

  Further, if necessary, a release layer may be provided between the transfer base film and the magnetic recording layer to facilitate the peeling of the magnetic recording layer from the transfer base film during transfer. You may form the intermediate | middle layer shown in 2002-293067.

A heat-sensitive adhesive layer can be used in the pattern forming method and the transfer laminate of the present invention. The heat-sensitive adhesive layer generally contains a resin exhibiting heat-sensitive adhesiveness.
Examples of the resin exhibiting heat-sensitive adhesion include vinyl chloride resins such as copolymers of vinyl chloride and vinyl acetate, or copolymers added with vinyl alcohol, maleic anhydride or acrylic acid, and polyester resins. , Acrylic resin, polyimide resin, polyurethane resin and the like.
The colorant in the pattern forming region can be diffused through the heat-sensitive adhesive layer toward the surface of the transfer material. The speed and difficulty of diffusion vary depending on the type of resin used in the heat-sensitive adhesive layer, but can be adjusted by appropriately selecting the temperature applied to the transfer material and the resin used in the magnetic recording layer. In order to facilitate the diffusion of the colorant, it is preferable that the Tg of the binder resin used for the heat-sensitive adhesive layer is lower than the temperature applied to the transfer material.

As the solvent used for the heat-sensitive adhesive layer, for example, the solvents described in the magnetic recording layer can be used. A resin exhibiting heat-sensitive adhesive properties is dissolved in a solvent, mixed and stirred to prepare a heat-sensitive adhesive layer coating, and this adhesive layer coating is applied to the magnetic recording layer by a known method such as reverse method, gravure method, die coating method, etc. It is obtained by applying and drying by the method.
The thickness of the adhesive layer is preferably 0.5 to 15 μm, particularly preferably 0.5 to 5 μm.

  The formation of the pattern forming region in the pattern forming method of the present invention can be performed by printing the following pattern forming ink.

The pattern printing ink contains a binder resin, a colorant, and a solvent.
The colorant for the pattern printing ink is not particularly limited depending on the type of the colorant, as long as it has the property of being able to diffuse in the magnetic recording layer and the colored layer by heat. For example, oil-soluble dyes such as monoazo, disazo, metal complex, anthraquinone, phthalocyanine, triallylmethane, and perylene that have been used in various coloring fields, and inorganic pigments include alumina and titanium oxide. There are many organic pigments such as azo, phthalocyanine, quinacridone, perylene, anthraquinone, thioindigo, and indanthrene, such as chromium oxide, iron oxide, zinc oxide, and barium sulfate. Easy dyes are preferred, and oil-soluble dyes are particularly preferred.

As the binder resin used in the pattern printing composition, known and commonly used binder resins can be used. For example, the resin used in the magnetic recording layer and the heat-sensitive adhesive layer can be mentioned, but when the pattern is formed on the heat-sensitive adhesive layer of the transfer laminate for forming the magnetic recording layer, the heat-sensitive adhesive that performs pattern printing is used. Adhesive agent, and a binder resin that has good adhesion to the card oversheet base material and does not hinder the adhesiveness when transferring the transfer material on the transfer laminate to the card oversheet base material, Binder resins for heat sensitive adhesives can be suitably used.
As the solvent used for the pattern printing ink, known and commonly used solvents can be used. For example, the solvents already described in the magnetic recording layer and the heat-sensitive adhesive layer can be used.

Ink for pattern printing is publicly known as a two-roll mill, a three-roll mill, a ball mill, a sand mill, a disper, etc., with a colorant used alone or in combination with a binder resin and a solvent that dissolves the binder resin. It is dispersed by a conventional method to form a pattern printing composition, which is prepared from the composition.
For the printing of the pattern, known printing methods such as gravure printing, flexographic printing, offset printing, screen printing, and ink jet can be used. In particular, gravure printing is suitable from the viewpoint of printing quality and productivity.
The film thickness of the pattern printing region is not particularly limited, but when the film is formed in a transfer laminate, the transfer laminate for forming a magnetic recording layer is generally wound up in a reel shape. Therefore, if the level difference due to the film thickness difference between the non-printing area and the printing area is large, the transfer material on the transfer laminate may be deformed, which may deteriorate the adhesion between the transfer material and the card substrate. The film thickness is preferably 0.5 to 5 μm, particularly preferably 0.5 to 2.0 μm.

  In this way, the pattern printing ink is used to form a pattern on, for example, the heat-sensitive adhesive surface of the transfer laminate for forming the magnetic recording layer or the portion of the card oversheet base to which the magnetic recording layer is transferred.

  In order to diffuse the colorant of the pattern formed before the card base material for the concealment card through the transfer material such as the heat-sensitive adhesive layer and the magnetic recording layer in the surface direction, the transfer material is overcoated with the card base material. After being transferred to the center core, the sheet is sandwiched between the over-sheet opposite to the center core and pressed with a mirror plate for pressing, and subjected to hot pressing for several tens of minutes to several hours at a temperature of 100 to 160 ° C. to transfer the colorant. Diffuse to the surface side. Further, as a method of diffusing the pattern formed in the transfer laminate into the transfer material before transfer, the transfer laminate is allowed to stand in a high temperature environment of 40 to 80 ° C. for several hours to several days before the transfer process. The colorant can be diffused in advance to the substrate side of the transfer laminate by this heat so that the colorant has already diffused to the surface side of the transfer material after transfer of the laminate.

  FIG. 4 shows a flowchart of a first concealment card manufacturing method using the concealment card substrate. After coating and forming the concealing layer, the pattern forming region, and the colorant diffusion preventing layer on the card base for the concealing card in order, the colorant of the pattern is moved in the concealing layer in the surface direction by performing hot press. The pattern which diffuses and is identifiable is formed, punched into a card shape, and the concealment card of the present invention is obtained.

The masking layer of the present invention contains a binder resin, a colorant, and a pigment as components.
Pigments used for the colorant include alumina, titanium oxide, chromium oxide, iron oxide, zinc oxide, barium sulfate, etc. as inorganic pigments, and azo, phthalocyanine, quinacridone, perylene, anthraquinone, as organic pigments, There are many types such as thioindigo and indanthrene, but there is no particular limitation. Moreover, it can replace with the said pigment or can also use together dyes, such as a phthalocyanine dye, an azo dye, a nitro dye, a quinoline dye, a methine dye, an azine dye, a fatalein dye.
As a pigment that can effectively conceal the color of the magnetic layer, scaly metal powder can also be used, and as the metal, aluminum, gold, silver, copper, brass, titanium, chromium, nickel, nickel chromium, stainless steel, etc. are used. be able to. The flake metal powder is adjusted to a plate shape by a ball mill or the like, and the size in the plane direction of these shapes is preferably 5 to 25 μm, more preferably 10 to 15 μm. The thickness is about 0.1 to 1 μm.

As the binder resin used for the coating material for the concealing layer, known and commonly used binder resins can be used. For example, in addition to the binder resin described for the magnetic recording layer, polyimide resin, polyamide resin, rosin-modified maleic acid resin, polystyrene resin, shellac, alkyd resin, and the like can be given. It can also be thermally cured using an isocyanate compound.
The colorant in the pattern forming area can be diffused through the masking layer to the masking card surface. Although the diffusion speed and the degree of difficulty vary depending on the type of resin, the temperature applied to the shielding layer and the resin used for the shielding layer can be appropriately selected and adjusted. In order to facilitate the diffusion of the colorant, it is preferable that the Tg of the binder resin used for the hiding layer is lower than the temperature applied to the hiding layer.

As the solvent used for the coating material for the concealing layer, known and commonly used solvents can be used. For example, the solvents already described for the magnetic recording layer can be used.
A colorant and a pigment are mixed in a binder resin and a solvent that dissolves the binder resin, or two or more kinds are mixed and dispersed by a known and usual method such as a two-roll mill, a three-roll mill, a ball mill, a sand mill, or a disper. Then, a masking layer coating material is prepared, and this is coated and dried by a known method such as a reverse method, a gravure coating method, a die coating method, and the like, thereby obtaining a masking layer.
In addition, the concealing layer effectively conceals the hue of the magnetic recording layer by applying the scaly metal powder to the base for a concealing card and then applying a paint containing a colorant. A concealment card having a hue other than the original hue of the metal powder can be created, and a plurality of layers can be applied in this way.

The film thickness of the concealing layer is preferably thick to conceal the brown or black color of the magnetic recording layer. However, when the card is formed, it is positioned on the surface layer side of the card relative to the magnetic recording layer. Therefore, if the film thickness of the concealing layer is too large, the spacing increases, the reproduction output characteristics deteriorate, and the information reading The possibility of error occurrence increases. In addition, the pattern forming method of the present invention diffuses the colorant in the pattern forming area in the direction of the surface of the transfer material to form an identifiable pattern. Therefore, the colorant diffuses and is identifiable on the pattern forming area. Area is needed. If the thickness of the region is too thin, the pattern is not sufficiently formed, and the colorant is diffused in the lateral direction and the pattern tends to become unclear. On the other hand, if the thickness of the region is too thick, the diffusion region may be too wide and the picture may become unclear.
Therefore, the thickness of the concealing layer needs to be a thickness corresponding to the material of the concealing layer that sufficiently conceals the hue of the magnetic recording layer. From the above viewpoint, it is preferably more than 2 μm and more than 3 μm. Further preferred. Further, the upper limit is preferably 15 μm or less, and more preferably 10 μm or less so as not to reduce the reproduction output of the magnetic recording layer excessively. The thickness of the diffusion region that can be positioned on the pattern forming region such as the concealing layer, the heat-sensitive adhesive layer, and the magnetic recording layer is preferably 50 μm or less, more preferably 20 μm or less so that the pattern does not become unclear.

The colorant diffusion prevention layer has the property of preventing the colorant of the picture diffused through the heat-sensitive adhesive layer, magnetic recording layer, concealment layer, etc. from being further diffused outside beyond the colorant diffusion prevention layer. Further, in the card manufacturing process, the coloring agent in the pattern forming area is prevented from adhering to the metal plate for hot press. These colorant diffusion preventing layers function as a protective layer for the magnetic stripe transfer material of the magnetic stripe transfer material. Moreover, it is preferable that it is substantially transparent so that the pattern of the colorant which has diffused to just below the colorant diffusion preventing layer can be identified.
In addition, it is more preferable that the ultraviolet ray is well transmitted.
Examples of the binder resin constituting the colorant diffusion preventing layer include a binder resin, for example, a cellulose resin, a butyral resin, an acrylic resin, a polyurethane resin, a polyester resin, a copolymer of vinyl chloride and vinyl acetate, or Mention may be made of vinyl chloride resins such as copolymers added with vinyl alcohol, maleic anhydride or acrylic acid, epoxy resins, phenol resins, melamine resins, and mixtures of these resins.
In order to effectively prevent the colorant, it is preferable to use a resin having a Tg higher than the hot press temperature when the colorant diffuses.

Examples of the solvent used in the colorant diffusion prevention coating include ketones such as acetone, methyl ethyl ketone, and cyclohexanone, esters such as methyl acetate, ethyl acetate, and butyl acetate, alcohols such as ethanol, hexane, toluene, xylene, and the like. These hydrocarbons can be mentioned, and these solvents can be used as a mixture of two or more.
Furthermore, soybean lecithin, microsilica, wax, or the like can be added as a film modifier to these colorant diffusion preventing layers as necessary. Moreover, it is preferable to add a curing agent such as a polyisocyanate compound to crosslink between the resin binder molecules in order to improve the durability of the colorant diffusion preventing layer.
The colorant diffusion preventing layer is obtained by applying the colorant diffusion preventing layer coating material prepared as described above onto a temporary support film by a known and common method such as a reverse method, a gravure method, or a die coating method.
The dry coating thickness of these colorant diffusion preventing layers is preferably as thin as possible from the viewpoint of recording / reproduction characteristics. However, in consideration of balance with strength, durability, etc., 0.1 to 5 μm is preferable, and 0.3 to 2 μm is further preferable. preferable.
Moreover, a pattern can also be formed by a normal printing method using the coloring ink normally used as needed between a hiding layer and a coloring agent diffusion prevention layer.

Thus, after providing a concealing layer and a colorant diffusion preventing layer on a concealing card substrate, for example, temperature-pressing is performed under conditions of a temperature of 100 to 130 ° C., a pressure of 10 to 20 kg / cm ² , and a time of 5 to 30 minutes. By doing so, the colorant diffuses in the concealing layer in the surface direction, and the card surface is also smoothed. The concealment card base material thus laminated with the concealment layer is then punched into a card shape to obtain the concealment card of the present invention.

  Next, the flowchart of the 2nd concealment card manufacturing method is shown in FIG. The second method is to form a concealing layer and a colorant diffusion preventing layer of the colorant by a transfer process, and the colorant diffusion preventing layer (also protecting layer) 8, the concealing layer 6, If necessary, a heat-sensitive adhesive layer is applied to form a transfer laminate, on which the magnetic recording layer and the pattern forming region are already formed, the transfer laminate is placed on the magnetic recording layer side of the concealed card substrate. The heating adhesive layer side of the body is overlapped and hot-pressed to transfer the transfer material onto the concealed card substrate, and the colorant in the pattern formation area is heat sensitive depending on the position where the pattern formation area was originally formed. By diffusing in the direction of the surface of the concealment card through the adhesive, the concealment layer, or the magnetic recording layer, an identifiable pattern is formed. The concealment card base material on which the concealment layer is formed is then punched into a card shape to obtain a concealment card.

As the transfer substrate used for the concealment card transfer sheet, the same material as the transfer substrate used for the transfer tape for the magnetic recording layer can be used. The thickness of the transfer substrate used is not particularly limited, but is usually 3 to 300 μm, preferably 50 to 200 μm.
The colorant diffusion prevention layer used in the concealment card manufacturing method using the transfer sheet of the present invention basically requires the same function as the colorant diffusion prevention layer shown in the explanation of the first concealment card manufacturing method. Therefore, the same paint can be used, but in this manufacturing method, release from the transfer substrate is required, so if the colorant diffusion prevention layer does not have release, silicone resin etc. on the transfer substrate film After the release layer is applied, a colorant diffusion preventing layer is formed by coating. The coating method for the colorant diffusion preventing layer is the same, and it can be obtained by coating the coating material for the colorant diffusion preventing layer on the transfer substrate film by a known and common method such as reverse method, gravure method, die coating method and the like. The dry coating thickness of the colorant diffusion preventing layer is preferably as thin as possible in terms of recording / reproduction characteristics, but is preferably 0.1 to 5 μm, more preferably 0.3 to 2 μm in consideration of balance with strength, durability, and the like. .

For the masking layer, the masking layer coating material and coating method shown in the description of the first masking card manufacturing method can be used in the same manner, and the film thickness of the masking layer is also 2 to 15 μm, particularly 3 to 10 μm. preferable. Moreover, a pattern can also be formed by the normal printing method using the coloring ink normally used as needed between a coloring agent diffusion prevention layer and a concealment layer.
The heat-sensitive adhesive is required to have a function of bonding the concealment card substrate and the transfer sheet by hot pressing, and the heat-sensitive adhesive paint and the coating method shown in the description of the process of transferring and forming the magnetic recording layer are used in the same manner. The film thickness of the heat-sensitive adhesive layer affects the output characteristics because the heat-sensitive adhesive layer of the transfer sheet is positioned closer to the surface layer of the card than the magnetic recording layer in the concealed card. The thickness should be as thin as possible within the range that satisfies the above.

The present invention will be described in more detail below using examples and comparative examples, but the present invention is not limited to the examples, and hereinafter, “parts” represents parts by mass.
In the examples and comparative examples, the transfer tape for magnetic recording layer and each coating material shown below are used.

<1. Preparation of transfer tape for magnetic recording layer>
In order to form an intermediate layer, a magnetic recording layer, and a colorant layer on a polyethylene terephthalate film having a thickness of 24 μm on the transfer substrate film, the following coating materials were prepared.

(Interlayer paint)
100 parts of iron oxide (“DNS-235” manufactured by Toda Kogyo Co., Ltd.)
11.0 parts of vinyl chloride copolymer (“Solvine TA2” manufactured by Nissin Chemical)
Cellulosic resin 11.0 parts (manufactured by Eastman Chemical Co., “CAP-482-0.5”)
8.8 parts of polyisocyanate (“Hardener No. 50” manufactured by Dainippon Ink & Chemicals, Inc. (active ingredient: 50%))
Sorbitan monostearate 5 parts (“SP-S10” manufactured by Kao)
MEK 400 parts Toluene 400 parts Cyclohexanone 200 parts The above materials were dispersed and mixed in a ball mill to prepare a coating for an intermediate layer.

(Paint for magnetic recording layer)
Hexagonal ferrite magnetic particles 100 parts {"MC-906" manufactured by Toda Kogyo Co., Ltd. 51.7 (kA / m)} 10 parts vinyl chloride resin ("MR-110" manufactured by Nippon Zeon Co., Ltd.)
5 parts of polyurethane resin ("T-5206" manufactured by Dainippon Ink & Chemicals, Inc.)
Sorbitan monostearate 5 parts (“SP-S10” manufactured by Kao)
6 parts of polyisocyanate (“Hardener No. 50” manufactured by Dainippon Ink & Chemicals, Inc. (active ingredient: 50%))
MEK 50 parts Toluene 50 parts Cyclohexanone 15 parts Using the above materials, a coating material for a magnetic recording layer was prepared by the method described in JP-A 09-059541.

(Coating for heat-sensitive adhesive layer)
1 part of polyurethane resin (“TS-03” manufactured by Dainippon Ink & Chemicals, Inc.)
4 parts of vinyl chloride-vinyl acetate copolymer resin (“Solvine C5” manufactured by Nissin Chemical)
MEK 45 parts Toluene 50 parts

The above materials were stirred and thoroughly dissolved with a disper to homogenize to prepare a heat-sensitive adhesive paint.
A polyethylene terephthalate film having a thickness of 24 μm was used as a transfer support film, and an intermediate layer coating was applied on one side of the film to form an intermediate layer having a dry film thickness of 0.5 μm. A magnetic recording layer coating was applied on the intermediate layer to form a magnetic recording layer having a dry film thickness of 12 μm. Further, a heat-sensitive adhesive layer coating was applied on the magnetic recording layer to form a heat-sensitive adhesive layer having a dry film thickness of 1.5 μm, thereby preparing a magnetic recording layer transfer tape.

<2. Making ink for pattern printing>
(Ink for pattern printing [A])
Amine salt of chromium complex dye 4 parts <C. I. Solvent Black 43>
("Eisenspiron Black GMH Special" manufactured by Hodogaya Chemical Co., Ltd.)
Polyurethane resin 2 parts ("TS-03" manufactured by Dainippon Ink & Chemicals, Inc.)
8 parts of vinyl chloride-vinyl acetate copolymer resin (“Solvine C5” manufactured by Nissin Chemical)
MEK 43 parts Toluene 43 parts The above materials were stirred and sufficiently dissolved with a disper to homogenize, and a pattern ink [A] was produced.

(Ink for pattern printing [B])
Copper phthalocyanine dye <C. I. Solvent Blue 70> 4 parts
(BASF “Neozapon Blue 807”)
Polyurethane resin 2 parts ("TS-03" manufactured by Dainippon Ink & Chemicals, Inc.)
8 parts of vinyl chloride-vinyl acetate copolymer resin (“Solvine C5” manufactured by Nissin Chemical)
MEK 43 parts Toluene 43 parts The above materials were stirred and sufficiently dissolved with a disper to homogenize, and a pattern ink [B] was produced.

(Ink for pattern printing [C])
10 parts of carbon black ("REGAL99R" manufactured by CABOT CORPORATION)
8 parts of vinyl chloride-vinyl acetate copolymer resin (“VAGH” manufactured by Union Carbide)
Polyurethane resin 2 parts ("TS-03" manufactured by Dainippon Ink & Chemicals, Inc.)
MEK 40 parts Toluene 40 parts Polyisocyanate 4 parts (“Hardener No. 50 (active ingredient: 50%)” manufactured by Dainippon Ink & Chemicals, Inc.)
Pre-kneaded meat was prepared with two rolls together with carbon black and vinyl chloride-vinyl acetate copolymer resin, and then passed through a sand mill together with other materials to produce a pattern ink [C].

(Ink for pattern printing [D])
Copper phthalocyanine pigment 10 parts Vinyl chloride-vinyl acetate copolymer resin 8 parts ("VAGH" manufactured by Union Carbide)
Polyurethane resin 2 parts ("TS-03" manufactured by Dainippon Ink & Chemicals, Inc.)
MEK 40 parts Toluene 40 parts Polyisocyanate 4 parts (“Hardener No. 50 (active ingredient: 50%)” manufactured by Dainippon Ink & Chemicals, Inc.)
Preliminary meat was performed with a two-roll roll together with a copper phthalocyanine pigment and a vinyl chloride-vinyl acetate copolymer resin, and then passed through a sand mill with other materials to produce a pattern ink [D].

<3. Preparation of paint for colorant diffusion prevention layer>
(Colorant diffusion prevention coating (with release from transfer substrate))
Cellulose acetate resin 8 parts ("L-20" manufactured by Daicel Chemical Industries)
Cellulose acetate propionate resin 2 parts
(Eastman Chemical "CAP-504-0.2"
Acetone 25 parts Ethyl acetate 25 parts Toluene 20 parts Cyclohexanone 20 parts Polyisocyanate 4 parts (Hardener No. 50 (active ingredient: 50%) manufactured by Dainippon Ink & Chemicals, Inc.)
Among the above materials, all except for the polyisocyanate are sufficiently dissolved by stirring with a disper, and then the above polyisocyanate is added, and further stirred and homogenized with a disper to obtain a coating material for a colorant diffusion preventing layer. Produced.

<4. Preparation of coating material for concealment layer>
(Concealment layer paint)
Sintered metal powder: 20 parts of aluminum powder (“210EA” manufactured by Showa Aluminum Powder Co., Ltd.)
16 parts of vinyl chloride-vinyl acetate copolymer resin (“VAGH” manufactured by Union Carbide)
4 parts of polyurethane resin (“TS-03” manufactured by Dainippon Ink & Chemicals, Inc.)
Methyl ethyl ketone 75 parts Toluene 75 parts Cyclohexanone 17 parts Polyisocyanate 5 parts ("Hardener No. 50 (active ingredient: 50%)" manufactured by Dainippon Ink & Chemicals, Inc.)
Of the above materials, all except for the polyisocyanate were sufficiently dissolved by stirring with a disper, and then the above polyisocyanate was added, and further stirred and homogenized with a disper to prepare a coating material for a concealing layer.

J. et al. Non-pattern part filling layer paint

16 parts of vinyl chloride-vinyl acetate copolymer resin (“VAGH” manufactured by Union Carbide)
4 parts of polyurethane resin (“TS-03” manufactured by Dainippon Ink & Chemicals, Inc.)
Methyl ethyl ketone 75 parts Toluene 75 parts Cyclohexanone 17 parts Polyisocyanate 5 parts ("Hardener No. 50 (active ingredient: 50%)" manufactured by Dainippon Ink & Chemicals, Inc.)
All of the above materials except for polyisocyanate are stirred with a disper and dissolved sufficiently, then added with the above polyisocyanate, and further stirred and homogenized with a disper to produce a paint for a non-pattern filling layer. did.

Example 1
As pattern printing, the pattern printing ink [A] is applied onto the surface of the heat-sensitive adhesive layer of the magnetic recording layer transfer tape prepared as shown in FIG. 6 so that the dry film thickness of the pattern portion is 1 μm by gravure printing. Printing was done.
Next, the heat-sensitive adhesive layer of the magnetic recording layer transfer tape prepared above is overlaid on a card base oversheet (made by Taihei Chemical Co., Ltd.) made of polyvinyl chloride, and the temperature is 120 ° C. with a heat sealer (made by Tester Sangyo Co., Ltd.). The film was adhered under a pressure of 1 kg / cm ² for 5 seconds and heated and pressurized to remove the transfer substrate film. After that, heat is applied under the condition that the temperature is 130 to 140 ° C., the pressure is 20 kg / cm ² , the pressure is 20 kg / cm ² , and the pressure is 20 minutes for 20 minutes with a desktop test press machine (manufactured by Tester Sangyo Co., Ltd.). The substrate was pressed and sufficiently cooled to produce a concealed card substrate.
Next, a masking layer coating material is applied on the masking card substrate prepared above to form a masking layer having a dry film thickness of 5 μm, and a colorant diffusion prevention layer coating material is applied thereon to a coating film having a dry film thickness of 1 μm. A colorant diffusion prevention layer is formed, followed by hot-pressing under a condition of heating and pressurizing at a temperature of 120 ° C., a pressure of 17 kg / cm ² , and a time of 20 minutes with a desktop test press (manufactured by Tester Sangyo Co., Ltd.). Then, it was cooled sufficiently to produce a concealment card.

(Example 2)
In the pattern printing of Example 1, a concealment card was prepared in the same manner as in Example 1 except that the pattern printing ink was changed to the pattern printing ink [B].

(Example 3)
In Example 1, the pattern printing is not performed on the magnetic recording layer transfer tape, and the dry film of the pattern portion is printed by the gravure printing method using the pattern ink [A] on the portion where the magnetic stripe of the card substrate oversheet is transferred. As shown in FIG. 7, pattern printing was performed so that the thickness was 1 μm. Thereafter, a concealment card was created in the same manner as the concealment card creation method of Example 1.

Example 4
In the pattern printing of Example 3, a concealment card was prepared in the same manner as in Example 3 except that the pattern printing ink was changed to the pattern printing ink [B].

(Example 5)
Using a polyethylene terephthalate film with a thickness of 188 μm as the transfer substrate film, a colorant diffusion prevention layer coating is applied thereon to form a colorant diffusion prevention layer with a dry film thickness of 1 μm, and a coating for the concealing layer is applied thereon. Then, a concealing layer having a dry film thickness of 5 μm was formed, and a heat-sensitive adhesive coating material was further applied thereon to form a heat-sensitive adhesive layer having a dry film thickness of 1 μm, thereby producing a concealment card transfer sheet.
Next, in the same manner as in Example 1, pattern printing is performed on the heat-sensitive adhesive layer surface of the magnetic recording layer transfer tape prepared above, and the magnetic recording layer is transferred onto the oversheet, the center core, and the oversheet on the opposite surface. The base material for concealment cards was produced with the press.
Thereafter, the heating adhesive layer side of the transfer sheet is superimposed on the magnetic tape side of the base material for the concealment card, and subjected to hot press processing under conditions of a temperature of 120 ° C., a pressure of 17 kg / cm ² , and a time of 20 minutes, Cooling was performed sufficiently to produce a concealment card.

(Example 6)
In the pattern printing of Example 5, a concealment card was prepared in the same manner as in Example 5 except that the pattern printing ink was changed to the pattern printing ink [B].

(Example 7)
In Example 5, the pattern printing is not performed on the magnetic recording layer transfer tape, and the gravure printing method using the pattern ink [A] is applied to the portion where the magnetic stripe of the card substrate oversheet is transferred as shown in FIG. In addition, pattern printing was performed. Thereafter, a concealment card was created in the same manner as the concealment card creation method of Example 5.

(Example 8)
In the pattern printing of Example 7, a concealment card was prepared in the same manner as in Example 7 except that the pattern printing ink was changed to the pattern printing ink [B].

(Comparative Example 1)
The heat-sensitive adhesive layer of the magnetic recording layer transfer tape having no pattern forming region is overlaid on a card base oversheet (made by Taihei Chemical Co., Ltd.) made of polyvinyl chloride, and the temperature is 120 ° C. by a heat sealer (made by Tester Sangyo Co., Ltd.). The transfer substrate film was removed by bonding under a pressure of 1 kg / cm ² for 5 seconds under heat and pressure. After that, heat is applied under the condition that the temperature is 130 to 140 ° C., the pressure is 20 kg / cm ² , the pressure is 20 kg / cm ² , and the pressure is 20 minutes for 20 minutes with a desktop test press machine (manufactured by Tester Sangyo Co., Ltd.). The substrate was pressed and sufficiently cooled to produce a concealed card substrate. Next, using a polyethylene terephthalate film with a thickness of 188 μm, apply the above colorant diffusion prevention layer (protective layer) coating on one side of the film using a reverse coater so that the film thickness after drying becomes 1 μm. And dried. On top of that, the pattern ink [C] was used and the pattern was formed by gravure printing so that the thickness of the pattern after drying was 1 μm. Further, a heat-sensitive adhesive layer coating was applied thereon to form a heat-sensitive adhesive layer having a dry film thickness of 1 μm, thereby producing a concealment card transfer sheet. Thereafter, the heating adhesive layer side of the transfer sheet is superimposed on the magnetic tape side of the base material for the concealment card, and subjected to hot press processing under conditions of a temperature of 120 ° C., a pressure of 17 kg / cm ² , and a time of 20 minutes, Cooling was performed sufficiently to produce a concealment card.

(Comparative Example 2)
In Comparative Example 1, a pattern is printed by gravure printing using a pattern printing ink [D] instead of the pattern ink [C], and then a non-pattern portion is printed using a gravure plate that becomes a negative pattern of the pattern. The filling paint was printed so that the film thickness after drying was adjusted to 1 μm so as to fit the portion other than the pattern portion formed with the pattern ink [D]. Thereafter, a concealment card was produced in the same manner as in Comparative Example 1.
The concealment cards of Examples 1 to 8, Comparative Example 1, and Comparative Example 2 were evaluated by the following evaluation methods.

(Creativity)
The magnetic stripe portion of the magnetic card was visually evaluated.
○. . . Both contrast and color development are good.
Δ. . Contrast is unclear or color development is insufficient.
×. . . Contrast is unclear and color development is insufficient.
The results are shown in Table 1.

(Output fluctuation)
About the obtained magnetic card, using a model 6900 magnetic card analyzer manufactured by Minato Electronics Co., Ltd., a 210 ftpi signal was recorded (recording current 100 mA) in JIS-2 format, and the output (maximum value, minimum value, average value) It was measured. From the result, the output fluctuation was obtained by the following equation. Regarding the transfer type magnetic tape used to make this magnetic card sample, the thickness of the magnetic recording layer is not single, but the thickness of the magnetic recording layer is adjusted according to each spacing and output. Adjustments were made so that the average value was equal to the reference card output.
Output fluctuation (%) = (maximum output value−minimum output value) / average output value ○. . . Less than 7%. Δ. . . 7% or more and less than 15%. ×. . . 15% or more.
(Productivity of concealment card manufacturing process)
○. . . It is more productive than conventional manufacturing methods.
Δ. . . Productivity as before ×. . . Productivity is inferior to conventional manufacturing methods.

  As is apparent from the results in Table 1, Examples 1 to 8, which are the production methods of the present invention, have at least the same designability and productivity as the conventional method and have very little influence on the magnetic reproduction output. Therefore, it is possible to form a pattern on the entire surface of the card base at one time regardless of whether it is on the base or the magnetic recording layer. In contrast, the conventional method of Comparative Example 1 has a large fluctuation in magnetic reproduction output, and the method of Comparative Example 2, which is one of the improved methods of the conventional method, is improved in fluctuation of the magnetic reproduction output. A negative pattern of the pattern has to be formed, and the manufacturing method is inferior and the productivity is lowered.

The cross-sectional block diagram of the concealment card | curd of this invention. It is the flowchart which showed the manufacturing method of the concealment card | curd base material among the manufacturing methods of this invention. It is the cross-sectional block diagram which showed the structure of the base material for concealment cards of this invention. It is the flowchart which showed the manufacturing method in the case of manufacturing a concealment card | curd by application | coating using the base material for concealment cards among the manufacturing methods of this invention. It is the flowchart which showed the manufacturing method in the case of manufacturing a concealment card | curd using the base material for concealment cards and a transfer sheet among the manufacturing methods of this invention. The front view which gave the pattern printing to the transfer tape for magnetic recording layers of this invention. The front view which gave the pattern printing to the part to which the magnetic stripe of the oversheet for card base materials of this invention was transferred.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Oversheet 2 Center core 3 Center core 4 Oversheet 5 Magnetic recording layer 6 Hiding layer 7 Normal printing pattern 8 Colorant diffusion prevention layer (also protective layer)
9 Colorant diffusion site 10 Transfer base material 11 Magnetic recording layer 12 Heat-sensitive adhesive layer 13

Claims (7)

  It has a magnetic recording layer on at least a part of the card substrate, has a concealment layer laminated to conceal the entire surface of the card substrate on the side having the magnetic recording layer, and is identified from the surface of the concealment layer A method of manufacturing a concealment card having a possible pattern, wherein the pattern is formed in advance on a card substrate and / or between the magnetic recording layer and the card substrate before the concealment layer is laminated, A method for producing a concealment card, characterized by diffusing the colorant in the surface direction when the concealment card is formed.   The method of manufacturing a concealment card according to claim 1, wherein the pattern is formed on the card substrate before the magnetic recording layer is formed.   The method of manufacturing a concealment card according to claim 1, wherein the pattern is formed on a transfer laminate for forming the magnetic recording layer.   The concealing card manufacturing method according to claim 1, wherein the colorant is a dye.   The method for manufacturing a concealment card according to any one of claims 1 to 4, wherein a substantially transparent diffusion prevention layer for preventing diffusion of a colorant is provided on the concealment layer.   It has a magnetic recording layer on at least a part of the card substrate, has a concealment layer laminated to conceal the entire surface of the card substrate on the side having the magnetic recording layer, and is identified from the surface of the concealment layer A concealing card having a possible pattern, wherein the colorant forming the pattern is distributed at least over the entire width in the film thickness direction of the concealing layer at a position corresponding to the pattern. The concealment card according to claim 6, wherein the colorant is distributed over the entire width in the film thickness direction of the concealing layer and the magnetic recording layer.

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